How do you pan zoom rotate the viewport while drawing with the grease pencil tool?
What works for me using a wacom tablet is to enable &quot;emulate 3 button mouse&quot;.
That way I can draw with one hand, and with the other I press Ctr+Alt and press and move the sytuls to Zoom in or out.
To rotate press Alt and press on the stylus.
To pan press Alt+Shift and move by pressing the stylus.
Pressing Ctrl will let you erase without changing the tool.
To roll the view you need to create a new keyboard binding so that you can use Ctrl+Shift and the scroll wheel on the mouse.
Read: https://blender.stackexchange.com/a/15051/92768